Iron staircase with flagstone stairs.



Y .LL/nm. IRON STAIRGASE WITH PLAGSTONB STAIRS.

APPLICATION FILED MAY 17, 1913.

1,073,250, Patented sept.'16,1913.

Inventor Witnessesi Attorney,

IOLUMBIA PLANDURAPH c0..wAsHlNaTqN.vU.

:wo smsen insane, .10E ANNE-@LMI semanita intenso.

Specification of LettersatetiPatentedSeptrtaltil.

Application led May 17, 1913.1 `Seri-a1 No. 768,375.

TQ all whom, t may ccncem:

Be it known that I, JOSEPH LANG, a su ject ofthe German Emperor,residing at 15 `Werftstrasse, iMannhiin; Germany,` have invented acertain new and useful Iron Staircase with Flagstone Stairs, of whichVthe following is a specification.

The objectV of theinvention is a fireproof, cut, housed or bracketedstair-case for residential and business houses in which the two stringsare constructed of iron, and the treads, sometimes also the risers, offlag stones. In the known stair-cases of this kind there are fixed tothe strings or their brackets angle irons and the flag stones are fixedto these by means of screws. According to this present invention,however, the transverse rails which connect together the two stringsserve at the same time for fixing the covering without the assistance ofscrews or rivets. lThese rails are provided as gutters and before theflag stones are placed in position are iilled with cement, gypsum, or asimilar material which when hardening iirmly clings to the flags. Theadvantage of this construction, in comparison with known constructions,consists in that the covering is strengthened by the transverse rails.Vhile building wooden boards can be placed on the transverse railsinstead of the flag stones so that the staircase can be used during thebuilding operations, at the saine time saving the flag stones. Thetreads are advantageously supported by two transverse rails, one at thefront and one at the rear end, and the front transverse rail of onetread and the rear transverse rail of the next lower rail are formed inone piece with the riser disposed between them. In this Vmanner specialrisers are not required.

The object of the invention is illustrated in the accompanying drawings.

Figure 1 shows a bracketed stair-case partly in side elevation andpartly in longitudinal section. Fig. 2 is a section on the line A A ofFig. 1. Fig. 3 is a cross section of the line B B. Fig. t is a crosssection corresponding to Fig. 2 of a modication. Fig. 5 shows a stringand a transverse rail connected thereto in plan. Fig. 6 is the frontstring of a housed stair-case in cross section and Fig. 7 is a stair ofa further modification in longitudinal section.

The two iron strings a are connected together by iron transverse railsb, in Fig. 1

threeiand inigf twosuch rails are provide'd'for each stair tread. -Theserails are at-both ends riveted to cheeks c which are stamped 'fromthefbrackets tZ -of-the strings c and bent inward. To the rails I) arefixed the treads c consisting of flag stones and in Fig. l also therisers The rails b :formed as gutters are filled with cement, gypsum, ora similar material which when hardening clings to the flags c or f whichhave been placed in position. In order that the filling may be retainedin the rails the lat-ter can be of swallow tail cross section (Fig. l)or when of semi-circular cross section provided with an inwardly turnededge 721 (Fig. 7).

According to the constructional form shown in Fig. 7 the frontsupporting rail of one tread c and the rear supporting rail Z) of thenext lower tread, with the intermediate riser f, are constructed in onepart, therefore combined to form a single rail.

The front string a and its brackets Z are covered as shown in Figs. land 2 with flag stones g and in Fig. t with sheets of metal g1 which areheld in position by decorative laths 71,. In Fig. 4 the lower decorativelath simultaneously serves for holding the lower covering t' of thestair-case in position. The upper decorative lath 7L of the brackets das shown in Figs. 2 and t can also be provided with a gutter which islled with cement or the like in order to aiiord a further hold to thetread c.

What I claim as my invention and desire to secure by Letters Patent isl. In an iron stair-case the combination of Vtwo iron strings, a numberof iron transverse rails connecting together said strings, a number oftreads consisting of flag stones and placed upon said rails, the latterbeing formed as gutters and filled with an artificial stone mass whichwhen hardening clings to said treads.

2. In an iron stair-case the combination of two iron strings providedwith a number of brackets, cheeks stamped from said brackets, a numberof iron transverse rails fixed at both ends to said cheeks and thusconnecting together said strings, a number of treads consisting of flagstones and placed upon said rails, the latter being formed as guttersand iilled with an artificial stone mass which when hardening clings tosaid treads.

3. In an iron stair-case the combination of two iron strings, a numberof iron transwith an artificial stone mass which when Verse railsconnecting together said strings, hardening clings to said treads. anumber of treads consisting of flag stones In testimony whereof I havehereunto and placed upon said rails, two rails being signed my nametothis specioationin the 5 povided for ealh fg said treads, a numberpresence of two subscribing witnesses. o iron risers, t e ont supportingrail of o i one tread and the rear supporting mil of y A. JOSEPH LANG'the next lower tread being constructed in VWitnesses: one part with theintermediate riser, and HEINRICH LOUDERHOOFV A, 10 said rails beingformed as gutters and filled JOSEPH PFEIFFER.

Copies of this patent may be obtained for ive cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

